package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {
    @Autowired
    DishService dishService;
    @Autowired
    SetmealService setmealService;

    /**
     * 根据id删除分类，删除之前需要进行判断
     * @param id
     */
    @Override
    public void remove(Long id) {
        //1、检查当前分类下是否有对应的菜品
        // SELECT COUNT(*) FROM `dish` WHERE category_id = 1397844263642378242
        // 结果大于0 ，则不能删除  代码结束 return R.error("当前分类下有菜品，不能删除")
        LambdaQueryWrapper<Dish> dishQW = new LambdaQueryWrapper<>();
        dishQW.eq(Dish::getCategoryId,id);
        int dishCount = dishService.count(dishQW);
        if(dishCount>0){
            throw new CustomException("当前分类下关联了菜品，不能删除");
        }
        //2、检查当前分类下是否有对应的套餐
        // SELECT COUNT(*) FROM `setmeal` WHERE category_id= 1397844263642378242
        //结果大于0 ，则不能删除  代码结束 return R.error("当前分类下有套餐，不能删除")
        LambdaQueryWrapper<Setmeal> setmealQW = new LambdaQueryWrapper<>();
        setmealQW.eq(Setmeal::getCategoryId,id);
        int setmealCount = setmealService.count(setmealQW);
        if(setmealCount>0){
            throw new CustomException("当前分类下关联了套餐，不能删除");
        }
        //正常删除分类
        super.removeById(id);
    }
}
